Short is correct
You must enclose it in a way a crab can't dig under or a single wish willy sneak in the lid..
You need to water, even on days that it rains in the morning. The sandy soil does not retain moisture.
The soil is very basic- pineapples and other fruits do not do well.
The soil is short of nitrogen also. Your best bet is soil in bags from the city, as growing medium in elevated trays with screen covers. The covers cut down the sun a good bit....
Guava, papayas, key limes, and seagrapes do well as do coco plums